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Eucalyptus costata

Eucalyptus costata Behr & F. Muell. ex F. Muell., Trans. Victorian Inst. 1: 33 (1855).
TYPE: South Australia, Angaston, Behr, 12.1848 (lecto MEL 1552443; fide Hill et al. 2001, isolecto K). Cited as "Behr & Muell. Coll."; "In the Mallee scrub, from the Murray River to Spencer's Gulf."
Eucalyptus incrassata subsp. costata (Behr & F. Muell.) F.C. Johnston & Hall, Proc. Roy. Soc. Victoria n.s. 91: 204 (1980).
Eucalyptus incrassata var. costata (Behr & F. Muell.) N. Burb., Trans. & Proc. Roy. Soc. South Australia 71: 150 (1947).

Habit: Mallee, Height to 5 m high.
Bark: Bark smooth throughout, grey or grey-brown, shedding in long ribbons. Branchlets green. Pith glands present; Bark glands present. Cotyledons obreniform (bilobed).
Leaves: Intermediate leaves disjunct early, elliptic to ovate, straight, entire, dull grey green to dull green, petiolate, 10 cm long, 5 mm wide. Adult leaves disjunct, lanceolate or broad lanceolate, not falcate, obtuse or apiculate, basally tapered, glossy or semi-glossy, grey-green, thick, concolorous, 6–11 cm long, 1.5–2.5 mm wide; Petioles narrowly flattened or channelled, Petioles 10–20 mm long. Lateral veins obscure, acute, moderately spaced.
Inflorescences: Conflorescence simple, axillary; Umbellasters 3-flowered to 7-flowered, regular. Peduncles narrowly flattened or angular (to 3mm wide), 13–20 mm long. Pedicels terete, 3–5 mm long.
Flowers: Buds cylindrical or fusiform, not glaucous or pruinose, 12–20 mm long, 6–8 mm diam. Calyx calyptrate; shedding early. Calyptra conical (often beaked), 2 times as long as hypanthium or 3 times as long as hypanthium, as wide as hypanthium; smooth, or ribbed. Hypanthium smooth, or ribbed. Flowers cream.
Fruits: Fruits cylindrical or urceolate (slightly), pedicellate, 3–4 locular, 8–13 mm long, 7–11 mm diam. Disc depressed. Valves enclosed. Chaff dimorphic, linear and cuboid, chaff same colour as seed.

Occurrence: Locally frequent; mallee shrubland on red aeolian sands.
Distribution: S.A., or N.S.W., or Vic. N.S.W. regions South Western Plains, or South Far Western Plains.

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